1. Shadows
CSE 681

2. Testing for shadows
CSE 681

3. Pseudo-code For each light source i
If face is backface wrt light source (called self-shadowing)
Set IN-SHADOW to TRUE
else
Set IN-SHADOW to FALSE
Construct ray from point to light source
For each object
Test ray-object intersection (between point and l.s.)
If intersection found
Set IN-SHADOW to TRUE for this light source
Break out of object loop
If (NOT IN-SHADOW) add in effect of light source I
accumulate diffuse light
accumulate specular light
CSE 681